SGS Thomson Microelectronics TDF1778 Datasheet
.OUTPUTCURRENT UP TO 2.5A
.WIDERANGEOFSUPPLYVOLTAGES:+8 to
+32V
.CAN WITHSTAND OVERVOLTAGES OF AS
HIGHAS 60 VBETWEEN V
ANDGROUND
CC
.INTERNAL ZENER DIODE PROVIDES FAST
SWITCHINGOF INDUCTIVELOADS
.OUTPUT VOLTAGE CAN BE LOWER THAN
GROUND
DESCRIPTION
TheTDF1778isadualsourcedriverdeliveringhigh
output currents and capable to drive any type of
loads(Electrovalves,contactors,lamps).
This deviceis essentiallyblow-outproof,each output isprotectedagainstshort-circuits.If internaldissipationbecomestoohigh,driverswillshutdownto
prevent excessive heating. An ”ALARM” output is
providedtoindicatetheactionofthethermalprotection.Toreactivatethepoweroutputs,theresetinput
mustbe forcedtolow state.
”SENSE” information of both power outputs are
ORedtogetherand thenprocessedinternally.
A ”STROBE” inputisalsoprovidedto offerthe possibilityof disablingthepoweroutputs.
TDF1 778
DUAL 2-A SOURCE DRIVER
MULTIWATT11
ORDERING NUMBER : TDF1778SP
PIN CONNE CTION
April1993
1 - Output1
2 - VCC
3 - Output2
4 - N.C.
5 - Strobe
6 - Ground
7 - Input2
8 - Sense output
9 - Alarmoutput
10 - Resetinput
11 - Input1
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TDF1778
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
V
I,Vreset
V
strobe
I
O
P
T
oper
T
tot
Supply Voltage 35 V (60 V/10 ms) V
Input Voltage (pins 7, 10 and 11) – 30 to + 50 V
Strobe Input Voltage – 0.5 to V
Output Current Internally Limited A
Power Dissipation Internally Limited W
Operating Ambient Temperature Range – 40 to + 85 °C
Junction Temperature + 150 °C
j
CC
THERMAL DATA
Symbol Parameter Value Unit
R
R
th(j–c)
th(j–a)
Junction-case Thermal Resistance Max. 3 °C/W
Junction-ambient Thermal Resistance Max. 40 °C/W
V
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TDF1778
ELECTRICAL CHARACTERISTICS (VCC= + 24V, – 40oC<Tj<+85oC, unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
V
CC
I
CC
V
IL
V
IH
V
I
IH
I
IL
V
OH
V
OL
V
CC–VO1
VCC–V
I
OL
V
CC–VO1
VCC–V
I
O1,IO2
I
Oalarm
I
Osense
I
IHsense
V
IHsense
Power SupplyVoltage 8 – 32 V
Power Supply Current (pin 6), I01=I02=2A – – 20 mA
Logic Input Voltage (pins 7, 10, 11) –
2
Logic Input Threshold (pin 5) – 0.8 – V
I
–
–
0.8
–
High Level Input Current (pins 7, 10, 11) VI= + 2V – 20 50 µA
Low Level Input Current (pins 7, 10, 11) VI= + 0.8V – 5 0 + 5 µA
High Level Logic Output Voltage (pins 8, 9)
I(8) = I(9) = – 30 µA 2.4 4 –
Low Level Logic Output Voltage (pins 8, 9)
I(8) = I(9) = 2 mA – 0.4
Output Saturation Voltage (V(7) high, V(11) high, IO= 2A) –
O2
– 1.5 1.8
Low Level Input Current (pins 1, 3)
V(7) Low, V(11) Low, V
Switch–off Output Voltage (inductive load) 40
O2
Available Output Current (pins 1, 3), V(7) High, V(11) High,
V
CC–VO
= 32V, Tj=25°C
= 0V – 400 1000
O
44
–
–
100
––
48 V
Available ”Alarm” Output Current, V(9) = + 4V 4 8 – mA
Available ”Sense” Output Current, V(8) = + 4V 4 8 – mA
Output Sensing High Level Input Current (pins 1, 3) VI=+2V –12mA
High Level ”Sense” Input Voltage (pins 1, 3) 0.8 1.9 2.5 V
V
V
V
V
µA
mA
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